Insulating-bushing for electric conductors and binding-posts.



F. W. COLE.

INSULATING BUSHING FOR ELECTRIC GONDUGTORS AND BINDING -POSTS.

APPLICATION FILED APR.15, 1910.

1,010,592. Patented Dec.5,1911.

il/iiflesses; 1720672307 UNITED STATES PATENT OFFICE.-

FREDERICK w. COLE, OF NEWTON, MASSACHUSETTS, ASSIGNOR TO THE FIRE ALARM TELEGRAPH COMPANY, .OF NEW YORK, N. Y., A CORPORATION OFNEW YORK.

Specification 0|. Letters Patent. Application filed April 15, 1910. Serial No. 555,007.

Patented Dec. 5, 1911.

To all whom itmay concern:

Be it known that I, FREDERICK \Y. Conn, of Newton, in the county of Middlesex and State of Massachusetts, have invented an Improvement in Insulating-Bushings for Electric Conductors and Binding-Posts, of which the following is'a specification.

Thisinvention relates to insulating bushings for electric conductors, binding-posts, and other things, and has for its object the construction of a bushing adapted to be projected through a hole in a case or other object, and to be securely held in lace, which is self-adjusting to objects of di erent thicknosses;

The bushing embodying my invention may be composed of ceramic or non-carbonizable material having high insulating properties, such as porcelain. t

In the preferred embodiment of my inventiontthe self-adjusting tubular bushing comprises a cylindrical bod having an enlargement at each end, bot of which may be made conical, one of said enlargements being made smaller than the other to admit of the bushing being rejected through ,a hole in an ob1ect, and a retaining-device, preferably yielding, adapted to be arranged on the body, as for instance on the conical portion of the smaller enlargement thereof, and which also engages the object and acts to hold the bushing firmly in place.

Various forms of retaining-devices may be employed, adapted to embrace or engage the contracted neck of the bushing. The bushing is especially well suited to receive and serve as an insulating support for a binding-post, which maybe arranged therein and extended therethrough, and, if desired, the binding-post may be secured thereto by cement or otherwise.

Figure 1 is a side view oft-an insulating bushing embodying this invention having a bindm -post arranged in it, Fi 2 isa vertical fongitu'dinal section of the, same, Fig. 3 is a plan view of the same, Fig. 4'is a side view of'theinsulating bushing and retaining-device thereon, the binding-fpost being removed, Fi 5 is a plan view 0 the same, Fig. 6 is a etail of one form of retaining-device which may be employed, Figs. and 8 are details of other forms of retaining-devices which may be employed.

As here shown 1) represents an'msulator which is made as a tubular bushing. It is composed of porcelain, or other ceramic or equivalent non-carbonizable material having high insulating properties. It is made of a length to extend through a hole ,in an object o, and to project more or less at each side thereof. It comprises a cylindrical body having conical enlargementsat each end. The conical enlargement b is larger than the hole through the object, and the conical enlargement b is made smaller than said hole to admit of the smaller end of the bushing being projected through the object by an endwise movement. The body ortion between said enlargements b and 2 is represented at b.

While the preferable form of bushing is, composed of porcelain, yet, so far as in invention is concerned, it may be composed of any other insulating material.

This bushing is held in position by a suit able retaining-device, which, as here shown,

its ends, thereby forming an elastic ring which may be passed over the end of the bushing to, embrace the body portion 25 Said ring is made larger in diameter than the hole through which the bushing projects, so that, when sprun on to the bushing and disposed between the smaller enlargement thereof and the object, it engages the conical portion of said enlargement and also the object and acts to yieldingly hold the bush-' ing in position. The bushing is thus yieldingly engaged and securely held in osition. Such a retaining-device is especia ly well suited for a bushin made of porcelain, although it is applica le to a'bushing made of an other material.

nFig; v7 9. pair of clips d, (Z, are emplqyed as the retaining-device, which, when connected together, embrace the body of the bushing, and when disposed between the smaller enlargement thereof and the object, will act to hold .the bushing in position.

Said retaining-device is not, however, of a yielding character like the form shown in vention is adapted to the employment of' many difi'erent forms oi retaining-devices.

The forms shown in Figs, 6 and 7, it will be noted, are not connected with or attached to the object, hence may be applied without providing the object with means for receiv mg any attaching-means; whereas the form shown in Fig. 8 requires the ob ect to be provided with a screw-threaded hole for an attaching-screw. The form shown in Fig. 6 or some substantial equivalent thereof is preferred. 2!)

In all the forms shown the bushing is selfadjusting to objects of difierent thicknesses through which it projects, so that notwithstanding slight variations in thickness, it

. will accommodate itself thereto.

"While the tubular bushing may be emplayed for electric-conductors and other things, it may serve as an insulating-support for a hindin -post.

Referring to Figs. 1, 2 and 3, a bindingpost is arranged in the bushing which 'consists of a cylindrical or other shaped stem or shanh a,'having an enlarged cylindrical or other shaped head a, with a shoulder a formed at the junction of said. head and stem. The stem is made smooth; that is to say, it is devoid of the usual screw-threads. The head and also the lower end of the stem are or maybe slabbed off to provide fiat faces, represented respectively at a, a a ainst which the under sides of the heads or the binding-screws a may bear, or washers arranged under said heads, which binding-screws extend through transverse holes in the post. Said binding-screws will serve as means for connecting thecircuit-wires with the binding-post. The binding-post is designed to be held in the bushing by cement, yet, so far as other features of my invention are concerned, said-post may beotherwise constructed or fastened in any usual or suitable manner.

I claim: 1., A self-adjusting bushing comprising a body having an enlargement at each end,

the enlargement at one end being conical and smaller than the enlargement at the other end to admit of the bushing being proment to admit of the bushing being pro jected through a hole in an object, and a retaining-device adapted to be arranged on said body in engagement with both the smaller enlargement and the object, substantially as described.

3. A self-adjusting bushing comprising a body having a conical enlargement at each end, the enlargement at one end being smaller than the enlargement at the other end to admit of the bushing bein projected through,a hole in an object, and a retaining-device adapted to be arranged'on the conical portion of said smaller enla'gement and in en agement with the object, substantially as escribed.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

FREDERICK W. COLE.

Witnesses:

B. J. Norms, H. B. DAVIS. 

